Edge trimming device



Oct. 6, 1964 Filed July 26. 1960 F. GRECO EDGE TRIMMING DEVICE 4 SheetsSheet l 214. I9 30 g a Z 22 r '4 21 2| 2 2 2! +4 r g 27 I 28 L 2| L A FIG I v INVENTOR. F RANK GREGG ATTORNE y Oct. 6, 1964 F. GRECO 3,151,587

EDGE TRIMMING DEVICE Filed July 26. 1960 4 Sheets-Sheet 2 -INVENTOR. FRANK GREOO BY 41145411 M ATTORNEY Oct. 6, 1964 F. GRECO EDGE TRIMMING DEVICE 4 Sheets-Sheet 5 Filed July 26. 1960 INVENTDR. FRANK GREGG ATTORNEY Oct. 6, F. GRECO EDGE TRIMMING DEVICE Filed July 26, 1960 4 Sheets-Sheet 4 l8 FIG 8 INVENTOR. FRANK GREGG ATToRNE Y United States Patent 3,151,587 EDGE TRlli/IMING DEVICE Frank Greco, Hasbrouck Heights, N..I., assignor, by mesne assignments, to Singer Company of Canada Ltd, Montreal, Quebec, Canada, a corporation of Canada Filed July 26, 1960, Ser. No. 45,452 1 Claim. (Cl. 112-1'23) This invention relates to an edge trimming device which has particular application to the conventional process used for the manufacture of belt loop raw material. Conventionally a strip of this material or work is passed through a folding device and divided into three portions. One of the three portions, which becomes the outside of the finished belt loop, is equivalent in width to the two other portions. The two portions on the underside of the material are sewn to one another by the conventional blindstitch sewing machine.

The raw material used for the manufacture of belt loops contains, in many cases, projecting threads or generally uneven edges. In order to insure proper formation of the belt loop material it is necessary to trim the edges of the material quite closely. The instant invention provides for an automatic method of trimming the material prior to its formation into belt loops and in conjunction with a sewing machine.

Other objects and advantages of the instant invention will become apparent as the description proceeds.

The invention may be briefly described as comprising an edge trimming device which in turn comprises a pair of spaced cutters adapted to abut the edge portions of the material to be trimmed. Means are provided which are operatively connected to the cutters and to a sewing machine and which are adapted to move said cutters in a reciprocating manner.

In the preferred modification of this invention a cutting table member is also provided between the cutters, a sewing machine is positioned rearwardly of the cutters, and a folding device intervenes the cutters and the sewing machine.

The invention will be further described by reference to the accompanying drawings which are made a part of this specification.

FIGURE 1 is a side view, partly in section, showing the cutting device of this invention in position upon a sewing machine.

FIGURE 2 is a detailed sectional view of a portion of the operating means for the cutters of this invention taken along lines 22 of FIGURE 1.

FIGURE 3 is a detailed sectional view of a portion of the operating means for the cutters of this invention taken along lines 3-3 of FIGURE 1.

FIGURE 4 is a detailed sectional view of a portion of the operating means for the cutters of this invention taken along lines 44 of FIGURE 1.

FIGURE 5 is a perspective View of the edge trimming device of this invention in position upon a sewing machine.

FIGURE 6 is a detail perspective view of the cutter members of this invention.

FIGURE 7 is a side view of the trimming device of this invention in position upon a sewing machine.

FIGURE 8 is a plan View, partly in section, of the trimming device of this invention in position upon a sewing machine.

The invention will now be described in detailed by reference to the specific modification set forth in the accompanying drawings. The reader must understand however that these specific modifications of the instant invention are for illustrative purposes and for purposes of example only. Various changes and modifications 3,151,587 Patented Oct. 6, 1964 could obviously be made within the spirit and scope of this invention and would occur to those skilled in this art.

The sewing machine 11 which may be used in this invention is preferably of the blindstitch type and comprises a base 13 having a supporting frame 12 thereupon, and a work support 8. A main drive shaft 14 is provided which is driven by a pulley 9 by means of a belt (not shown) connected to a source of power. Main shaft 14 in turn drives the needle bar 15, the looper 16, and the feed dogs (not shown). The machine shown is the conventional blindstitch sewing machine, is well known to those skilled in this art, and need not be further described.

A support member 17 is positioned forwardly of sewing machine 11 and is provided with a pair of recesses 18 which are adapted to accommodate shafts 19. Shafts 19 are in turn connected to cutters 20 and to bifurcated portions 21 of yoke member 22. Cutters 20 are adapted to abut the ledger edges 23 of cutting table member 24. A spring 25 is disposed across bifurcated portions 21 of yoke 22 in order to hold cutter members 20 close against ledger edges 23 of cutting table member 24.

Yoke member 22 is secured to connecting link 26 by pin 27. Shaft 26 is in turn connected to shaft 28 through the agency of link 28a, link 28a is connected to connecting link 26 by pin 29 while link 28a is fixedly secured to shaft 28 by clamp 28]). Shaft 28 is in turn secured to link 30. Link 30 is in turn secured to shaft 14. Link 36:: is fixedly secured by one of its ends to shaft 28 and at its other end is connected to link 30.

A folding device 32 intervenes cutting table member 24 and sewing machine 11 and is secured into position at such point.

The operation of the instant invention will now be explained.

Power is supplied to main shaft 14 which causes main shaft 14 to rotate and drive the feed dogs (not shown) of the sewing machine as well as needle bar 15 and looper 16. Belt loop material (not shown) is passed through folding device 32 and is thereby caused to be folded into thirds with one of the thirds being twice the size of the other thirds, as is conventional for belt loop material. As the material is passed through folding device 32 it is picked up by the feed dogs of sewing machine 11 and the edges of the material are blindstitched together. At the same time rotation of shaft 14 causes yoke 21 to move reciprocably. Thus the rotation of shaft 14 imparts a reciprocating motion to link 30 which in turn causes shaft 28 to oscillate through the medium of link 3&1. The motion of shaft 28 is transferred to connecting link 26 through link 28a thereby reciprocating connecting link 26. Since connecting link 26 is secured to yoke 22 the former imparts a rocking movement to the latter about shaft 19 in recesses 18. Pins 19a secure cutters 20 to shafts 19 and shafts 19 are secured to yoke 22 by pins 21a. Thus the rocking motion of yoke 22 causes cutters 20 to move up and down against the ledger edges of cutting table 24. As a result the material, which is supposed to be the width of cutting table 24 is trimmed into such width and therefore forms belt loop material of excellent quality.

The objects of the instant invention are thus achieved.

I claim:

In a sewing machine having a machine frame including a work support, stitch-forming instrumentalities supported by said machine frame, and Work feeding mechanism adapted to advance work past said stitch-forming instrumentalities to produce stitches in said work, a work trimming device including a cutting table member projectihg horizontally from said work support and provid ing parallel sides defining stationary ledger edges, a pair of supporting members secured to said machine frame and located on opposite sides of said cutting table member, a-pair ofaligned knife carrying shafts one journaled in each of said supporting members, a knife blade secured to each of said aligned knife-carrying shafts and disposed in Work trimming relation with a ledger edge on said cutting table member, a knife actuating yoke member including individual a'rins secured at their upper ends to said aligned knife carryingshafts'and supported for movement refatively towards each other, a spring, connected to and acting between said yoke arms yieldingly to influence said knife blades into work trimming relation with'said-ledg er edges on said cutting table member, and actuating mechanism connected to said yoke member to oscillate said knife carrying shafts about their aligned axes thereby to cause. said knife blades to cooperate with said ledger edges to trim work into'strip form, having a width determined by the spacing between said ledger edges.

References Cited in the file of this patent UNITED STATES PATENTS 1,103,825 Parkinson July 14, 1914 1,240,754 Mofiatt Sept. 18, 1917 1,416,998 Thomas 'et'al. May 23, 1922 1,466,151 Sharaf Aug. 28, 1923 1,913,878 Gardner June'13, 1933 1,946,558 Weis Feb. 13, 1934 2,646,759 Galkin July 28, 1953 

